;;; Compiled by f2cl version:
;;; ("$Id: f2cl1.l,v 1.209 2008/09/11 14:59:55 rtoy Exp $"
;;;  "$Id: f2cl2.l,v 1.37 2008/02/22 22:19:33 rtoy Rel $"
;;;  "$Id: f2cl3.l,v 1.6 2008/02/22 22:19:33 rtoy Rel $"
;;;  "$Id: f2cl4.l,v 1.7 2008/02/22 22:19:34 rtoy Rel $"
;;;  "$Id: f2cl5.l,v 1.197 2008/09/11 15:03:25 rtoy Exp $"
;;;  "$Id: f2cl6.l,v 1.48 2008/08/24 00:56:27 rtoy Exp $"
;;;  "$Id: macros.l,v 1.106 2008/09/15 15:27:36 rtoy Exp $")

;;; Using Lisp International Allegro CL Enterprise Edition 8.1 [64-bit Linux (x86-64)] (Oct 7, 2008 17:13)
;;;
;;; Options: ((:prune-labels nil) (:auto-save t)
;;;           (:relaxed-array-decls t) (:coerce-assigns :as-needed)
;;;           (:array-type ':array) (:array-slicing t)
;;;           (:declare-common nil) (:float-format double-float))

(in-package :clml.lapack)


(let* ((one 1.0) (zero 0.0))
  (declare (type (double-float 1.0 1.0) one)
   (type (double-float 0.0 0.0) zero) (ignorable one zero))
  (defun dlarfg (n alpha x incx tau)
    (declare (type (double-float) tau alpha)
     (type (array double-float (*)) x)
     (type (f2cl-lib:integer4) incx n))
    (f2cl-lib:with-multi-array-data ((x double-float x-%data%
                                      x-%offset%))
      (prog ((beta 0.0) (rsafmn 0.0) (safmin 0.0) (xnorm 0.0) (j 0)
             (knt 0))
            (declare (type (double-float) beta rsafmn safmin xnorm)
             (type (f2cl-lib:integer4) j knt))
            (cond ((<= n 1) (setf tau zero) (go end_label)))
            (setf xnorm (dnrm2 (f2cl-lib:int-sub n 1) x incx))
            (cond ((= xnorm zero) (setf tau zero))
                  (t
                   (setf beta
                         (- (f2cl-lib:dsign (dlapy2 alpha xnorm)
                                           alpha)))
                   (setf safmin (/ (dlamch "S") (dlamch "E")))
                   (cond ((< (abs beta) safmin)
                          (tagbody
                              (setf rsafmn (/ one safmin))
                              (setf knt 0)
                            label10
                              (setf knt (f2cl-lib:int-add knt 1))
                              (dscal (f2cl-lib:int-sub n 1) rsafmn x
                               incx)
                              (setf beta (* beta rsafmn))
                              (setf alpha (* alpha rsafmn))
                              (if (< (abs beta) safmin) (go label10))
                              (setf xnorm
                                    (dnrm2 (f2cl-lib:int-sub n 1) x
                                     incx))
                              (setf beta
                                    (- (f2cl-lib:dsign (dlapy2 alpha
                                                       xnorm)
                                                      alpha)))
                              (setf tau (/ (- beta alpha) beta))
                              (dscal (f2cl-lib:int-sub n 1)
                               (/ one (- alpha beta)) x incx)
                              (setf alpha beta)
                              (f2cl-lib:fdo (j 1
                                             (f2cl-lib:int-add j 1))
                                            ((> j knt) nil)
                                            (tagbody
                                                (setf alpha
                                                      (* alpha safmin))
                                              label20))))
                         (t
                          (setf tau (/ (- beta alpha) beta))
                          (dscal (f2cl-lib:int-sub n 1)
                           (/ one (- alpha beta)) x incx)
                          (setf alpha beta)))))
            (go end_label)
       end_label (return (values nil alpha nil nil tau))))))

(in-package #-gcl #:cl-user #+gcl "CL-USER")
#+#.(cl:if (cl:find-package '#:f2cl) '(and) '(or))
(eval-when (:load-toplevel :compile-toplevel :execute)

  (setf (gethash 'fortran-to-lisp::dlarfg
                 fortran-to-lisp::*f2cl-function-info*)
        (fortran-to-lisp::make-f2cl-finfo :arg-types '((fortran-to-lisp::integer4)
                                                       (double-float)
                                                       (array
                                                        double-float
                                                        (*))
                                                       (fortran-to-lisp::integer4)
                                                       (double-float))
          :return-values '(nil fortran-to-lisp::alpha nil nil
                           fortran-to-lisp::tau)
          :calls '(fortran-to-lisp::dscal fortran-to-lisp::dlamch
                   fortran-to-lisp::dlapy2 fortran-to-lisp::dnrm2))))

